If, all along, you could have rented it out for more money ... why were you planning to rent it out for less money? I get that you wouldn't have to, but it appears that the "market rate rent" was higher than you initially anticipated.
As a corollary, assuming that you had initially planned on the highest rent that the market would bear...it seems that after a year of unexpected delays you'd most likely still choose to finish the project even at a loss. This is because all the loss would have already been sunk cost that you can't change anymore, and at the "original maximum rent the market would bear" you'd still make your IRR/ROI on the marginal future investment of finishing the construction.
So, assuming you couldn't raise the rent, you'd lose money either way, but you'd lose less money by finishing the construction vs. losing more money by abandoning the project entirely.